cyclist lance armstrong is expected to make a shocking announcement when he appears in an interview with oprah this coming week. nick valencia takes a look at what the possible admission of performance enhancing drugs use could mean for armstrong's career. >> "i've said it for seven years, i've said it for longer than seven years, i have never doped. i can say it again, but i've said it for seven years, it doesn't help." >> reporter: help may be something lance armstrong will need a lot of to redeem his reputation after the u- s-a today reports armstrong will quote, "admit to doping throughout his career." the newspaper does not name their source, but says its a person with knowledge of the situation. u-s-a today says the former seven-time tour de france champion's admission, which had been widely rumored for weeks, is expected to come in a monday interview with oprah winfrey that will be taped for air thursday. as for why he's doing this now? the journalist who broke the story says armstrong had no choice. >> "with all the evidence that's come out against him it's hard to deny it anymor